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Understanding the astrophysical processes acting within galaxy groups andtheir effects on the evolution of the galaxy population is one of the crucialtopic of modern cosmology, as almost 60% of galaxies in the Local Universe arefound in groups. We imaged in the far (FUV 1539 A) and near ultraviolet (NUV2316 A) with GALEX three nearby groups, namely LGG93, LGG127 and LGG225. Weobtained the UV galaxy surface photometry and, for LGG225, the only groupcovered by the SDSS, the photometry in u, g, r, i, z bands. We discuss galaxymorphologies looking for interaction signatures and we analyze the SED ofgalaxies to infer their luminosity-weighted ages. The UV and optical photometrywas also used to perform a kinematical and dynamical analysis of each group andto evaluate the stellar mass. A few member galaxies in LGG225 show a distortedUV morphology due to ongoing interactions. (FUV-NUV) colors suggest thatspirals in LGG93 and LGG225 host stellar populations in their outskirts youngerthan that of M31 and M33 in the LG or with less extinction. The irregularinteracting galaxy NGC3447A has a significantly younger stellar population (fewMyr old) than the average of the other irregular galaxies in LGG225 suggestingthat the encounter triggered star formation. The early-type members of LGG225,NGC3457 and NGC3522, have masses of the order of a few 10^9 Mo, comparable tothe Local Group ellipticals. For the most massive spiral in LGG225, we estimatea stellar mass of ~4x10$^{10}$ Mo, comparable to M33 in the LG. Ages of stellarpopulations range from a few to ~7 Gyr for the galaxies in LGG225. Thekinematical and dynamical analysis indicates that LGG127 and LGG225 are in apre-virial collapse phase, i.e. still undergoing dynamical relaxation, whileLGG93 is likely virialized. (Abridged)

Galaxy Evolution in Local Group Analogs. I. A GALEX study of nearby groups